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https://github.com/riscv/riscv-opcodes.git
synced 2025-05-08 10:45:47 +08:00
3c73392134
* Don't run go fmt error in go_utils.py go_utils.py currently runs go fmt to pretty print the generated inst.go file. Unfortunately, this call to go fmt always fails as inst.go contains an internal import and go fmt is being run out of tree. Here we remove the code that attempts to format inst.go resulting in a clean run of go_utils.py without any errors. The generated file, inst.go, can be formatted when it's copied into the Go source tree, prior to its submission to the Golang project. * Add CSR support to go_utils.py go_utils.py now generates a Go map that maps CSR numbers to CSR names. The resulting map is written into inst.go for use by the Go assembler.
65 lines
1.5 KiB
Python
65 lines
1.5 KiB
Python
import logging
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import pprint
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import sys
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from constants import csrs
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from shared_utils import InstrDict, signed
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pp = pprint.PrettyPrinter(indent=2)
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logging.basicConfig(level=logging.INFO, format="%(levelname)s:: %(message)s")
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def make_go(instr_dict: InstrDict):
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args = " ".join(sys.argv)
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prelude = f"""// Code generated by {args}; DO NOT EDIT."""
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prelude += """
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package riscv
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import "cmd/internal/obj"
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type inst struct {
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opcode uint32
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funct3 uint32
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rs1 uint32
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rs2 uint32
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csr int64
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funct7 uint32
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}
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func encode(a obj.As) *inst {
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switch a {
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"""
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csrs_map_str = """ }
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return nil
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}
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var csrs = map[uint16]string {
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"""
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endoffile = """}
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"""
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instr_str = ""
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for i in instr_dict:
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enc_match = int(instr_dict[i]["match"], 0)
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opcode = (enc_match >> 0) & ((1 << 7) - 1)
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funct3 = (enc_match >> 12) & ((1 << 3) - 1)
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rs1 = (enc_match >> 15) & ((1 << 5) - 1)
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rs2 = (enc_match >> 20) & ((1 << 5) - 1)
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csr = (enc_match >> 20) & ((1 << 12) - 1)
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funct7 = (enc_match >> 25) & ((1 << 7) - 1)
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instr_str += f""" case A{i.upper().replace("_","")}:
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return &inst{{ {hex(opcode)}, {hex(funct3)}, {hex(rs1)}, {hex(rs2)}, {signed(csr,12)}, {hex(funct7)} }}
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"""
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for num, name in sorted(csrs, key=lambda row: row[0]):
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csrs_map_str += f'{hex(num)} : "{name.upper()}",\n'
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with open("inst.go", "w", encoding="utf-8") as file:
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file.write(prelude)
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file.write(instr_str)
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file.write(csrs_map_str)
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file.write(endoffile)
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